Quad Element Monsters, also known as Quads for short, are Monsters which contain four Elements, usually all four elements of the breedable Monsters available on their Island. When obtainable through breeding, they are created by breeding either two Doubles together, or one Triple and a Single, the latter yielding a better chance of breeding a Quad.
Like Triple Element Monsters, breeding Quads is not guaranteed to be successful, and so may result in one of their parent's offspring instead. Magical and Fire Quads have an even lower chance than Natural Quads. Due to this lower chance of success, it is recommended to use Monsters with lower breeding times, so that it takes less time to retry the combination.
The ten Quads found on the Natural Islands and Ethereal Workshop are nicknamed "the Bosses", according to the Boss Monument. Each one represents a Natural or Ethereal element or island. Besides representing Islands, it is unknown if this applies to any of the Fire or Magical Quads, although Tring and Sneyser themselves would likely represent Fire Haven and Fire Oasis, respectively.
- Entbrat represents the Plant Element and Plant Island.
- Deedge represents the Cold Element and Cold Island.
- Riff represents the Air Element and Air Island.
- Shellbeat represents the Water Element and Water Island.
- Quarrister represents the Earth Element and Earth Island.
- Whaill represents the Plasma Element.
- Pentumbra represents the Shadow Element.
- Vhenshun represents the Mech Element.
- Rhysmuth represents the Crystal Element.
- Oogiddy represents the Poison Element.
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